Its pretty annoying. I am a barista there and 14-16 year old girls are constantly asking me to make special designs in whip or drizzle etc. onto their drinks so they can take pictures of them and subsequently post them to FB or instagram. I don't really get it - its not like they went to a special restaurant and ordered some really nice food or had a friend surprise them with a special treat.
I was waiting for somebody to proffer this suggestion. all great baristas have mastered the art of making anatomically proportianate latte patterned dicks. You could always just get creative with the caramel sauce on the caramel "macchiatos" (siderant/ what is sold as a macchiato in sub-par coffee shops is an ultimate bastardisation on the original which is a single espresso shot with a drop of milk usually marked by the use of a little foam) see photo below of caramel sauce "art" from costa employee who knows his job as a "barista" is a joke.
word, being a barista is probably the easiest job in the world. i used to work at a multiple-award winning cafe/bistro and i was so jealous of the baristas (i was a cook). hell, i would draw stuff on people's coffees just out of boredom if i had that job.